Sube Posted May 13, 2008 Share Posted May 13, 2008 subawang: my 05 LGT is having the same problem. What is the resolution? Link to comment Share on other sites More sharing options...
subawang Posted May 13, 2008 Author Share Posted May 13, 2008 No resolution yet. But since the weather is warmer now, the problem has lain dormant. I also was not successful in datalogging the problem as it was already warming up at that time and did not throw any more codes. I suspect that it will not worsen until winter. . . Link to comment Share on other sites More sharing options...
CaP Posted May 28, 2008 Share Posted May 28, 2008 I too have the same issue with my 05 gt. Although the temperature threshold seems to be higher, probably closer to 35-40. I have only a misfire code on one cylinder, but the same issues with the rough idle, and nothing during acceleration. My car has been into the dealership multiple times and the dealer can not determine the cause - I have had all plugs replaced, the injectors swapped, and countless other tests/diagnostics run. None have improved the core issue. The latest "fix" by the dealer was to "update the software", which I believe may have only changed threshold at which my CEL comes on, and did nothing to address the problem. I too am frustrated, but there isn't much I can do now that it is warmer out and the CEL probably won't kick for a while. BTW - the "bad gas" excuse was thrown at me multiple times also...quite frustrating when you have tried every type of gas in the city Link to comment Share on other sites More sharing options...
batonrouge Posted May 28, 2008 Share Posted May 28, 2008 My car is a non-Turbo, but I've noticed a rough idle that disappears with acceleration/reving higher and no codes except for the infamous loose gas cap. After reading your above posts, I checked all vacuum lines I could find- all seem fine. I guess I'll just assume it's an injector that's a bit out of spec and I'll live with it for now. Note: I traded in an identical '06 which idled silky-smooth. From it's first mile I knew this 08 was different. Link to comment Share on other sites More sharing options...
CaP Posted May 28, 2008 Share Posted May 28, 2008 It's kind of funny that i posted, and then the next day the CEL kicks for the first time in weeks (by funny i mean sad). Anyways, i just wanted to clarify my rough idle - it's more of what i would call an intermittent misfire, that subtly shakes the car. It happens sporadically and you can feel the car shaking through the seat - its not too rough, but definitely noticeable. Its been happening for about 15k miles now. Link to comment Share on other sites More sharing options...
subawang Posted May 29, 2008 Author Share Posted May 29, 2008 It's kind of funny that i posted, and then the next day the CEL kicks for the first time in weeks (by funny i mean sad). Anyways, i just wanted to clarify my rough idle - it's more of what i would call an intermittent misfire, that subtly shakes the car. It happens sporadically and you can feel the car shaking through the seat - its not too rough, but definitely noticeable. Its been happening for about 15k miles now. Those are the same symptoms with mine. The colder the weather, the more violent the shaking, and presumably more frequent the misfires. Cap, get it in to the dealership while you still have the CEL illuminated. Hopefully whereever you are, the weather stays cold and the dealer will be able to reproduce. Link to comment Share on other sites More sharing options...
gianspi Posted May 29, 2008 Share Posted May 29, 2008 Did you swap out the o2 sensor as whitetiger suggested? He seemed to have the exact same problem but you didn't comment on his suggestion. enough zip ties and duct tape will fix anything. Link to comment Share on other sites More sharing options...
subawang Posted May 29, 2008 Author Share Posted May 29, 2008 Going back to whitetigers comments, I do believe my car is operating in closed loop when it should be based on datalogs. Furthermore, my problem is now dormant and has been since the weather has warmed. Would a bad o2 sensor only malfunction during cold weather? Link to comment Share on other sites More sharing options...
whitetiger Posted June 3, 2008 Share Posted June 3, 2008 ^its hard to say. maybe ther is a faulty connection with your o2 sensor. metal expands in the heat making the connection that would otherwise not be made. Ive seen some crazy stuff during my days as a tech. changing the front 02 is a piece of cake, so its worth doing even if the problem cant be confirmed all the time. Link to comment Share on other sites More sharing options...
subawang Posted June 8, 2008 Author Share Posted June 8, 2008 Point taken. I'll try to get around to it in the near future and report back. At the moment, I'm quite busy with the new house and business Link to comment Share on other sites More sharing options...
subawang Posted February 18, 2009 Author Share Posted February 18, 2009 Well, the dealer was finally able to figure it out after corresponding with the Subaru tech hotline. The problem was that intake manifold was leaking! So, they replaced 4 gaskets; both banks at the interface between the manifold and the TGV, and between the TGV and the heads. They figured this out by first determining from the tech hotline that this was a lean misfire, and then by spraying some carb cleaner at the problematic locations and seeing the engine rev. So, if you have all of the symptoms that I saw, you may want to have your tech investigate the manifold gaskets. Link to comment Share on other sites More sharing options...
dbrunone Posted February 18, 2009 Share Posted February 18, 2009 OK so....have you driven the car in very cold weather?? Did the problem return?? I'm hesitant to bring my stg2 car to a dealer to work on it. I wonder if they'd cover that under warranty. Link to comment Share on other sites More sharing options...
subawang Posted February 19, 2009 Author Share Posted February 19, 2009 Has been running perfect for 2 weeks now. Now I'll say that if other on these boards run into the same issue, then there is probably an issue with the stock gaskets. Link to comment Share on other sites More sharing options...
dbrunone Posted February 19, 2009 Share Posted February 19, 2009 from my thread here: http://legacygt.com/forums/showthread.php?t=104529 it seems like a lot of people have this problem, regardless of tune or mods. Can you post the dealership name, phone number, and any contacts you know of there? If I take my car in, i want to be able to refer them to someone who has fixed this problem. Thanks Link to comment Share on other sites More sharing options...
subawang Posted February 19, 2009 Author Share Posted February 19, 2009 Subaru Naperville. A google search should give you the number. I think all of the service advisors there are aware of my problems, but Bob L was the one dealing with it when it was fixed. It may also help if you mention that you read about it here on the forums. Link to comment Share on other sites More sharing options...
dbrunone Posted February 26, 2009 Share Posted February 26, 2009 Thanks for the info. They're looking at my car in a week to find out if there's a leaky intake manifold, or something else going on. I'll post back in a week. Link to comment Share on other sites More sharing options...
mylgt1 Posted March 6, 2009 Share Posted March 6, 2009 subawang do you know if there is a TSB on this issue? I'm having the same issues minus the codes and told my dealer about your outcome and they said there is nothing showing on that problem... I should just take it to Naperville! Link to comment Share on other sites More sharing options...
subawang Posted March 6, 2009 Author Share Posted March 6, 2009 There has been no TSB issued on the gaskets. You are having the same issues but have not thrown any codes yet? That's really odd. When it starts to misfire, just keep letting it stumble and eventually a CEL should be tripped. Link to comment Share on other sites More sharing options...
dbrunone Posted March 7, 2009 Share Posted March 7, 2009 So my dealer refused to even look at my car, cause its modified. BUT I did my own test, spraying carb cleaner everywhere I could find a junction on the intake, and the engine never revved. I guess that means no leak? Maybe my map sucks? Link to comment Share on other sites More sharing options...
WhatV8 Posted March 13, 2009 Share Posted March 13, 2009 Could be a bad map, could be a gasket that only leaks under boost and is sucked back in during vacuum. If the gasket is strong enough it may not blow completely out until it is cycled enough times. Personally I would start with a new map, since you are modified and go from there. Link to comment Share on other sites More sharing options...
dbrunone Posted March 15, 2009 Share Posted March 15, 2009 Yeah I think I'm gonna have MSPT re-tune it in a few months....I felt like TDC didn't put the TLC into it that they should have. I did the carb-cleaner spray test myself, and didn't find any leaks. Oh well... Link to comment Share on other sites More sharing options...
A_Tang Posted January 26, 2010 Share Posted January 26, 2010 Sorry it bothers anyone that I'm reviving this thread, but I've had the exact same problem as Subawang has described. The problem for me came up last winter, while the car was still under warranty, and then this winter, with my odo at about 69K miles. After numerous trips to both Loman and Morristown Subaru (in NJ) for the illuminated CEL (code P0171), I've had the MAF sensor, Air/Fuel Ratio sensor and a fuel injector cleaning done. Everytime I've taken the car in, they claimed that they "checked my vacuum hoses", reset the ECU, and suggested that I go to a different gas station. Since the CEL seems to go out on its own, and then come back on, I ignored it when it came on while I was in the Adirondacks and didn't bring it in to the dealer until it came on again. This time however, they informed me that it showed the codes for MISFIRE, all four cylinders. The service manager questioned me about whether I've driven out west where they have Ethanol in the fuel mixture. She also told me that they pulled a sample of my fuel, compared it to a "standard batch" of 93 octane fuel and said that it didn't test the same or even smell the same. After leaving my car there for a the whole weekend, the Morristown Subaru tech finally decided to dig deeper and remove my intercooler, etc, and noticed that there is a tear/crack in my turbo inlet pipe. Does this make sense, or is the dealership just shooting in the dark again? The other issue is with my warranty, which is no longer valid. I called Subaru Corporate and opened a case file. They told me they would call Morristown Subaru and see if they would do a good faith warranty repair. If not, I have pay the $700+ for the replacement of the turbo inlet pipe. Is there any other course of action I can take since this problem started well before my warranty had ran out? Thanks in advance for any advice. Al Well, the dealer was finally able to figure it out after corresponding with the Subaru tech hotline. The problem was that intake manifold was leaking! So, they replaced 4 gaskets; both banks at the interface between the manifold and the TGV, and between the TGV and the heads. They figured this out by first determining from the tech hotline that this was a lean misfire, and then by spraying some carb cleaner at the problematic locations and seeing the engine rev. So, if you have all of the symptoms that I saw, you may want to have your tech investigate the manifold gaskets. Link to comment Share on other sites More sharing options...
subawang Posted January 26, 2010 Author Share Posted January 26, 2010 Sorry it bothers anyone that I'm reviving this thread, but I've had the exact same problem as Subawang has described. The problem for me came up last winter, while the car was still under warranty, and then this winter, with my odo at about 69K miles. After numerous trips to both Loman and Morristown Subaru (in NJ) for the illuminated CEL (code P0171), I've had the MAF sensor, Air/Fuel Ratio sensor and a fuel injector cleaning done. Everytime I've taken the car in, they claimed that they "checked my vacuum hoses", reset the ECU, and suggested that I go to a different gas station. Since the CEL seems to go out on its own, and then come back on, I ignored it when it came on while I was in the Adirondacks and didn't bring it in to the dealer until it came on again. This time however, they informed me that it showed the codes for MISFIRE, all four cylinders. The service manager questioned me about whether I've driven out west where they have Ethanol in the fuel mixture. She also told me that they pulled a sample of my fuel, compared it to a "standard batch" of 93 octane fuel and said that it didn't test the same or even smell the same. After leaving my car there for a the whole weekend, the Morristown Subaru tech finally decided to dig deeper and remove my intercooler, etc, and noticed that there is a tear/crack in my turbo inlet pipe. Does this make sense, or is the dealership just shooting in the dark again? The other issue is with my warranty, which is no longer valid. I called Subaru Corporate and opened a case file. They told me they would call Morristown Subaru and see if they would do a good faith warranty repair. If not, I have pay the $700+ for the replacement of the turbo inlet pipe. Is there any other course of action I can take since this problem started well before my warranty had ran out? Thanks in advance for any advice. Al The tear in the turbo inlet pipe could definitely be the culprit. Not everyone will have the exact same problem as me (leaky intake manifold gasket). But, if you are throwing the running lean code, along with 4 cylidner misfires, chances are you are getting excess unmonitored air into your engine. I would try to get them to replace it under warranty as it most likely is the culprit, and probably was the cause from the start. They just didn't diagnose it properly. Link to comment Share on other sites More sharing options...
SBT Posted January 30, 2010 Share Posted January 30, 2010 Yes a tear/crack would cause that. And $700 to replace the turbo inlet pipe is about $450.00 over charging imo - Pro amore Dei et patriam et populum - Link to comment Share on other sites More sharing options...
max_bobby Posted January 30, 2010 Share Posted January 30, 2010 They had to change my intake manifold gaskets, that cured my issue. Good luck Link to comment Share on other sites More sharing options...
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